Full Idea
The simultaneous presence of two colours in the same place in the visual field is impossible, in fact logically impossible, since it is ruled out by the logical structure of colour.
Gist of Idea
Two colours in the same place is ruled out by the logical structure of colour
Source
Ludwig Wittgenstein (Tractatus Logico-Philosophicus [1921], 6.3751)
Book Reference
Wittgenstein,Ludwig: 'Tractatus Logico-Philosophicus (Pears)', ed/tr. Pears,D. /McGuinness,B. [RKP 1961], p.71
A Reaction
This sounds the wrong way around. We derive our concept of the logic of colour from experiencing the total incompatibility of two colours in the same location. What if each of our eyes saw a different colour?